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                <p>第一章SpringMVC概述<br>springvc:是基于spring的一个框架，实际上就是spring的一个模块，专门是做web开发的。理解是servlet的一个升级</p>
<p>web开发底层是servlet ,框架是在servlet基础上面加入一些功能，让你做web开发方便。</p>
<p>SpringMVC就是一个Spring。Spring是容器，ioc能够管理对象，使用<bean>，@Component，@Repository，@Service，@Controller，SpringMVC能够创建对象，放入到容器中（SpringMVC容器），SpringMVC容器中放的是控制器对象。</p>
<p>       我们要做的是使用@Controller创建控制器对象，把对象放入到SpringMVC容器中，把创建的对象作为控制器使用，这个容器对象能接受用户的请求，显示处理结果，就当做是一个servlet使用（类似但并不是）。</p>
<p>       使用@Controller注解创建的是一个普通类的对象，不是Servlet。SpringMVC赋予了控制器对象一些额外的功能。</p>
<p>Web开发底层是servlet，SpringMVC中有个对象是Servlet：DispatherServlet（中央调度器）</p>
<p>DispatherServlet：负责接收用户所有的请求，用户把请求给了DispatherServlet，之后DispathServlet把请求转发给我们的Controller对象，最后是Controller对象处理请求。</p>
<p>Index.jsp—DispatherServlet(Servlet)—转发，分配给—Controller对象(@Controller注解创建的对象)</p>
<p>第二章Springmvc请求的处理流程<br>1).发起请求some.do—</p>
<p>2).tomcat(web.xml—url-pattern知道 *.do的请求是给中央调度DispatcherServlet)—</p>
<p>3)DispatcherServlet(根据springmvc.xml配置知道some.do—dosome())——-4)DispatcherServlet把some.do转发给MyController.doSome()方法</p>
<p>5)框架执行dosome()把得到ModelAndView进行处理，转发到show.jsp</p>
<p>上面的过程简化的方式</p>
<p>       Some.do—DispatcherServlet—MyController</p>
<p>Springmvc执行过程源代码分析</p>
<p>tomcat启动，创建容器的过程<br>通过load-on-start标签指定的1，创建DispatcherServlet对象，DispatcherServlet它的父类是集成HttpServlet的，它是一个serlvet，在被创建时，会执行init()方法。在init方法中<br>//创建容器，读取配置文件<br>webApplicationContext ctx=new ClassPathXmlApplicationContext(“springmvc.xml”)；<br>//把容器对象放入到ServletContext中<br>getServletContext().setAttribute(key,ctx);</p>
<p>上面创建容器作用：创建@Controller注解所在的类的对象。创建MyController对象中，这个对象放入到springmvc的容器中，容器是map，类似map.put(“myController”, MyController对象)</p>
<p>请求的处理过程<br>1）执行serv的service()</p>
<p>Protected void service(HttpServletRequest request,HttpServletResponse response)</p>
<p>Protected void doService(HttpServletRequest request,HttpServletResponse response)</p>
<p>DispatcherServlet.doDispatch(request,response){</p>
<p>调用MyController的dosom()方法;</p>
<p>}</p>
<p>       复习springmvc框架以及如何接收用户的参数</p>
<p>没有加入Java到JSON转换的时候其中内存中的对象</p>
<p>text/plain;charset=ISO-8859-1</p>
<p>发起的请求是由哪些服务器程序处理的。</p>
<p>Tomcat本身能处理静态资源的访问，像html，图片，js文件都是静态资源。</p>
<p> 表示静态资源和未映射的请求都给default处理</p>
<p>Default这个servlet作用：</p>
<p>处理静态资源<br>处理未映射到其他servlet的请求</p>
<p>复习前两天的内容：</p>
<p>解决请求中post方式有中文乱码，使用过滤器解决问题。CharacterEncodingFilter</p>
<p>逐个接收中，请求中参数名和形参名不一样，使用注解@RequestParam解决问题</p>
<p>使用Java对象接收请求参数时，要求请求中参数名和属性名一样。</p>
<p>Springmvc处理器方法的形参还可以用Map、List等集合类型，数组都可以。</p>
<p>处理器方法的返回值：</p>
<p>       表示请求的处理结果</p>
<p>ModelAndView，表示数据和视图，对视图执行forward<br>String：表示视图的，可以逻辑名称，完整视图路径，对视图执行forward<br>Void：返回值本身不能表示数据和视图，可以相应ajax请求<br>对象Object：表示数据的，可以响应ajax请求。<br>Springmvc处理器返回对象，转为json响应ajax步骤：①加入处理java转为json转换的工具库：使用jackson。②在springmvc配置文件加入注解驱动&lt;mvc：annotation-dirver&gt;。③在处理器方法上面加入@Requestbody。</p>
<p>url-pattren设置中央调度器的url-pattern是“/”：表示静态资源访问失败都是404，动态资源可以正常访问（例如网页的请求）。</p>
<p>              第一种解决静态资源访问的方案：在spring的配置文件中1）<a href="mvc:default-servelt-handler">mvc:default-servelt-handler</a> 2）<a href="mvc:annotation-driven">mvc:annotation-driven</a>。（原理：给程序内存中增加一个处理器对象，DefaultHttpRequestHandler，让这个对象来处理静态资源的访问）</p>
<p>             </p>
<p>在jsp，html中使用的地址，都是在前端页面中的地址，都是相对地址</p>
<p>地址分类：</p>
<p>绝对地址，带有协议名称的是绝对地址，<a target="_blank" rel="noopener" href="http://www.baidu.com,ftp//202.122.23.1">http://www.baidu.com，ftp://202.122.23.1</a><br>相对地址，没有协议开头的，例如：user/some.do，/user/some.do。相对地址不能独立的使用，必须有一个参考地址，通过参考地址+相对地址本身才能够指定资源。<br>参考地址<br>在你的页面中的，访问地址不加“/”</p>
<p>访问的是：<a target="_blank" rel="noopener" href="http://localhost:8080/ch06_path/index.jsp">http://localhost:8080/ch06_path/index.jsp</a></p>
<p>路径：<a target="_blank" rel="noopener" href="http://localhost:8080/ch06_path/">http://localhost:8080/ch06_path/</a></p>
<p>资源：index.jsp</p>
<p>在index.jsp发起user/some.do请求，访问地址变为：<a target="_blank" rel="noopener" href="http://localhost:8080/ch06_path/user/some.do">http://localhost:8080/ch06_path/user/some.do</a></p>
<p>当你的地址    没有斜杠开头，例如 user/some.do，当你点击链接时，访问地址是当前页面的地址再加上你链接的地址。</p>
<p><a target="_blank" rel="noopener" href="http://localhost:8080/ch06_path/">http://localhost:8080/ch06_path/</a> + user/some.do</p>
<p>index.jsp 访问user/some.do，返回后现在的地址：<a target="_blank" rel="noopener" href="http://localhost:8080/ch06_path/user/some.do">http://localhost:8080/ch06_path/user/some.do</a></p>
<p>路径<a target="_blank" rel="noopener" href="http://localhost:8080/ch06_path/user/">http://localhost:8080/ch06_path/user/</a></p>
<p>资源：some.do</p>
<p>在index.jsp在user/some.do，就变为<a target="_blank" rel="noopener" href="http://localhost:8080/ch06_path/user/user/some.do">http://localhost:8080/ch06_path/user/user/some.do</a></p>
<p>       解决方案：</p>
<p>加入EL表达式也就是下面介绍的那个。<br>加入一个base标签，是html语言中的标签。表示当前页面中访问地址的基地址。表示你的页面中所有没有“/”开头的地址，都是以base标签中的地址作为参考地址，使用base中的地址+user/some.do组成访问地址</p>
<p>2）在你的页面加上斜杠“/”</p>
<p>       访问的是：<a target="_blank" rel="noopener" href="http://localhost:8080/ch06_path/index.jsp">http://localhost:8080/ch06_path/index.jsp</a></p>
<p>       路径：<a target="_blank" rel="noopener" href="http://localhost:8080/ch06_path/">http://localhost:8080/ch06_path/</a></p>
<p>点击       /user/some.do 访问地址变为<a target="_blank" rel="noopener" href="http://localhost:8080/user/some.do">http://localhost:8080/user/some.do</a>   参考地址是       你的服务器地址，也就是<a target="_blank" rel="noopener" href="http://localhost:8080/">http://localhost:8080</a></p>
<p>如果你的资源不能加入${pageContext.request.contextPath}（这个叫做EL表达式）</p>
<p><a href="/ch06_path/user/some.do">发起user/first.do的get请求</a></p>



<p>如果你的资源不能访问，有一个/是绝对的所以我们需要加入${pageContext.request.contextPath}这个EL表达式.</p>
<p>Index,jsp—addStudent.jsp—student/addStudent.do(Service的方法dao的方法)—result.jsp</p>
<p>第四章 SpringMVC核心技术<br>SpringMVC框架采用的是统一，全局的异常处理。</p>
<p>把Controller中的所有异常处理都集中到一个地方。采用的是aop的思想。把业务逻辑和异常处理代码分开，解耦合。</p>
<p>使用两个注解</p>
<p>1.@ExceptionHandler</p>
<p>2.@ControllerAdvice</p>
<p>拦截器：</p>
<p>1）拦截器是SpringMVC中的一种，需要实现HandlerInterceptor接口</p>
<p>2）拦截器和过滤器类似，功能方向侧重点不同。过滤器是用来过滤器请求参数，设置编码字符集等工作。</p>
<p>3）拦截器是拦截用户请求，做请求做判断处理。</p>
<p>4）拦截器是全局的，可以对多个Controller做拦截。一个项目中可以有0个或多个拦截器，他们在一起拦截用户请求。拦截器常用在：用户登录处理，权限检查，记录日志。</p>
<p>拦截器的使用步骤：</p>
<p>定义类实现HandlerInterceptor接口<br>在SpringMVC配置文件中声明拦截器，让框架知道拦截器的存在。<br>拦截器的执行时间：</p>
<p>       1）在请求处理之前，也就是Controller类中的方法执行之前先被拦截。</p>
<p>       2）在控制器方法执行之后也会执行拦截器。</p>
<p>       3）在请求处理完成后也会执行拦截器。</p>
<p>拦截器原理图</p>
<p>拦截器：看做是多个Controller中公用的功能，集中到拦截器统一处理，使用的是AOP的思想。掌握第一个preHandle()方法</p>
<p>============================================================</p>
<p>多个拦截器：</p>
<p>第一个拦截器preHandle=true，第二个拦截器preHandle=true</p>
<p>11111111拦截器的MyInterceptor的preHandle()</p>
<p>22222222拦截器的MyInterceptor的preHandle()</p>
<p>===================执行MyController中的doSome方法==============</p>
<p>22222222拦截器的MyInterceptor的postHandle()</p>
<p>11111111拦截器的MyInterceptor的postHandle()</p>
<p>22222222拦截器的MyInterceptor的afterCompletion()</p>
<p>111111111111拦截器的MyInterceptor的afterCompletion()</p>
<p>第一个拦截器preHandle=true，第二个拦截器preHandle=false</p>
<p>11111111拦截器的MyInterceptor的preHandle()</p>
<p>22222222拦截器的MyInterceptor的preHandle()</p>
<p>111111111111拦截器的MyInterceptor的afterCompletion()</p>
<p>第一个拦截器preHandle= false，第二个拦截器preHandle=true</p>
<p>11111111拦截器的MyInterceptor的preHandle()</p>
<p>拦截器和过滤器的区别</p>
<p>过滤去是Servlet中的对象，拦截器是框架中的对象。<br>过滤器是实现Filter接口对象，拦截器是实现HandlerInterceptor<br>过滤器是用来设置request，Response的参数，属性的，侧重对数据过滤的。拦截器是用来验证请求的，能截断请求。<br>过滤器是在拦截器之前先执行的。<br>过滤器是Tomcat服务器创建的对象。拦截器是SPringMVC容器中创建的对象。<br>过滤器是一个执行时间点，而拦截器是有三个执行时间点。<br>过滤器可以处理jsp，js，html等等。拦截器是侧重拦截对Controller的对象，如果你的请求不能被中央调度器DispatcherServlet接收，这请求不会执行拦截器的内容。<br>过滤器拦截普通类方法执行，过滤器过滤Servlet请求响应。</p>
<p>用拦截器验证用户身份</p>
<p>Ch12</p>
<p>SpringMVC的执行流程（理解）<br>ApplicationContext ctx = new ClassPathXmlApplication ( “beans.xml”) ;studentservice service = (studentService) ctx.getBean ( “service”) ;</p>
<p>SpringMVC内部请求的处理流程：也就是SpringMVC接收请求，到处理完成的过程</p>
<p>用户发起请求some.do<br>DispatcherServlet接收请求some.do，把请求转交给处理器映射器。<br>处理器映射器：SpringMVC框架中的一种对象，框架把视线了HandlerMapping接口的类都叫做映射器（多个）。</p>
<p>处理器映射器作用：根据请求，从SpringMVC容器对象中获取处理器对象（MyController controller=ctx.getBean(“some.do”)）</p>
<p>                             框架把找到的处理器对象放到一个叫做处理器执行链(HandlerExecutionChain)的类保存</p>
<p>HandlerExecutionChain：类中保存着：1.处理器对象(MyController)；2.项目中的拦截器List<HandlerIntercept></p>
<ol start="3">
<li>DispatcherServlet把2中的HandlerExecutionchain中的处理器对象交给了处理器适配器对象（多个)处理器适配器:springmvc框架中的对象，需要实现HandlerAdapter接口。I</li>
</ol>
<p>处理器适配器作用:执行处理器方法（调用MyController.doSome()得到返回值ModelAndView)</p>
<p>4．DispatcherServlet把3中获取的ModelAndView交给视图解析器对象。</p>
<p>视图解析器：SpringMVC的对象，需要实现ViewResoler接口（可以有多个）</p>
<p>视图解析器作用：组成视图完整路径，使用前缀，后缀。并创建View对象。</p>
<p>View是一个接口，表示视图，在框架中jsp，html不是string表示，而是使用View和他的实现类表示视图。</p>
<p>InternalResourceView:视图类，表示jsp文件，视图解析器会创建InternalResourceView类对象。这个对象的里面，有一个属性url=/WEB-INF/view/show.jsp</p>
<p>5．DispatcherServlet把4步骤中创建的view对象获取到，调用view类自己的方法，把Model数据放入到request作用域。执行对象视图的forward。请求结束。</p>

                
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                                    if (index_content < 0) {
                                        index_content = 0;
                                    }
                                    if (i === 0) {
                                        first_occur = index_content;
                                    }
                                }
                            });
                        }
                        // show search results
                        if (isMatch) {
                            str += "<li><a href='" + data_url + "' class='search-result-title'>" + data_title + "</a>";
                            var content = data.content.trim().replace(/<[^>]+>/g, "");
                            if (first_occur >= 0) {
                                // cut out 100 characters
                                var start = first_occur - 20;
                                var end = first_occur + 80;
                                if (start < 0) {
                                    start = 0;
                                }
                                if (start === 0) {
                                    end = 100;
                                }
                                if (end > content.length) {
                                    end = content.length;
                                }
                                var match_content = content.substr(start, end);
                                // highlight all keywords
                                keywords.forEach(function (keyword) {
                                    var regS = new RegExp(keyword, "gi");
                                    match_content = match_content.replace(regS, "<em class=\"search-keyword\">" + keyword + "</em>");
                                });

                                str += "<p class=\"search-result\">" + match_content + "...</p>"
                            }
                            str += "</li>";
                        }
                    });
                    str += "</ul>";
                    $resultContent.innerHTML = str;
                });
            }
        });
    };

    searchFunc('/search.xml', 'searchInput', 'searchResult');
});
</script>

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